A. M. Mayer — Researches in Acoustics. 



15 



in decimals. Under F are the durations of the residual sen- 

 sations computed by the formula 



33000 



_, / 33000 \ 



D= (^ +18)- 



\N+30 / 



0001 



in which D = the duration of the residual sensation given by 

 a sound of N number of vibrations per second. Under Gl- 

 are the differences between the computed and observed values 

 of the residual sensations. These differences are so small, 

 except in the case of SOL 3 , that we may adopt the empirical 

 formula as expressing the law, which connects the pitch of a 

 sound with the duration of its residual sonorous sensation. 

 This formula, however, only refers to my own auditory sensa- 

 tion. It is a physiological law and I imagine that the durations 

 of these residual sonorous sensations will vary more with dif- 

 ferent observers than do analogous visual sensations. It is 

 therefore to be wished that others will repeat these experi- 

 ments and obtain determinations which, when combined, will 

 give a law which may be accepted as the expression of the 

 average durations of the residual sonorous sensations. 





\ . t 



1 



1 ^^^I^'^itt' 



\ < ^^ ~~~~~~~~^~~' 



z^^--- 





300 



MCI 



ISOQ 1800 



24.00 3.600 a8oo v.cL 



Fig. 11. 



